Core bit construction



Aug. '30, 1932. L. H. WELLENSIEK CORE BIT CONSTRUCTION Filed March 24, 1931 2 Sheets-Sheet l BY mu.

. I ATTORNEY] Lh. Wei/92mm? INVENTOR g- 30, 1932- I L. H. WELLENSIEK CORE BIT CONSTRUCTION Filed March 24, 1951 2 Sheets-Sheet 2 A. /z' Wezaw'zsme INVENTOR Patented Aug. 30, 1932 UNITED" STATES PATENT OFFICE LOUIS H. WELLENSIEK, OF HOUSTON, TEXAS, ASSIGNOB TO HUGHES TOOL COMPANY,

OF HOUSTON,

TEXAS, A CORPORATION OF TEXAS GORE BIT CONSTRUCTION Application. filed larch 24, 1981. Serial Ho. 524,810.

ticular construction of. core-engaging dogswhich are easily operated and notliable to stick in position in .the head and fail to operate.

I also desire to provide anefliectiveand positive means of moving the dogs into coreengaging position. 1 J

It is a further object to provide means to effectively lubricate the drill head construction so that the parts may easily move when I it' is desired to operate the core catcher.

engaging dogs in I have as a further object to provide a drill head construction, whereby the cutter head may be easily connected and disconnected from the cutterbody when desired.

In the drawings herewith "Fig. 1 is a central longitudinal section through a core drill and its supporting body, the construction of which embodies a preferp'ed form of my in.-.

vention. Fig. 2 is a transverse section on the plane 2--2 of Fig. 1.

Fig. 3 is a similar section on the plane 3-3 of Fig. 1. j Fig. 4-is a broken section of a portion oFf the drill body taken on the plane H of ig./5 is a vertical section on an enlarged scale showing the construction ofmy coreengaging dogs.

Fig. 6 is'a similar view'showing the coreoperative position.

Fig. 7 is a perspective view of one of the dogs removed. p

Fig. 8 is a connecting pin engaging the cutter dogs in the operation of the core catcher.

Fig. 9 is a transverse section on the plane 9-9 of Fig. 1.

. lar engages slidably with In constructing my device I employ an. elongated tubular body 10. The lower end. of said body is increased somewhat in outer diameter and has a shoulder 11. at the lower end to contact with the upper ends 12 of the cutter supports 13. In the lower end of said, body are provided a plurality of cylindrical recesses 14 threaded to receive tubular pins 15 which connect the cutter body with the upper ends of the cutter supports. Thev upper end ofthe cutter body 10 isrecessed somewhat on its inner side 16 to receivev a. sleeve 17 acting as. a packing sleeve, as will be later described.

The upper end 18 of the cutter body abuts. against a shoulder 19 on the drill collar 20.. Said drill collar has an upper threaded socket 21 to engage with a tool joint or other cou pling member by means of which the drill may be attached to the drill stem. The drill collar telescopes slidably over the upper end of the cutter body 10 and is increased in internal diameter at 22, forming a shoulder 23 thereon to limit the upper movement of a floating ring 24 fitting between the drill collar and the body 10. Said ring has packing rings 25 on its outer surface and on its inner surface it engages with similar rings 25 set'in recesses in the outer periphery of the body 10. The lower end of the drill colthe lower end of the cutter body. The cutter supports 13 are made up of blocks of metal, he upper ends of which are .ejctended inwardly to en age on the upper of a cutter head 26. shaped member, the upper end of which is shouldered ofi to fit against shoulders 27 on the cutter supports. The lower end is beveled outwardly at 28. The outer side of the head 26' is recessed, slightly at 29 adjacent each of the cutters to provide a space in which the cutters may move. Each cutter support, 13 has a tapered shaft 30 thereon upon which the rotating cutters 31 are mounted. The

tubular pins 25. The outer side of each of the aid head is a ring 7 inner end of each cutter shaft 30 may be end of the drill bod cutter supports is formed with a mortised recess 35 transversely thereof, and the outer side of each of the tubular pins 15 is recessed to provide a keywa 36 within which the keys 37 may be received? Thus in assembling the drill head upon the drill body, the pins 15 will be threaded into the lower end of the drill body, and the drill head will then be moved into osition; the recesses in the head receiving t e lower ends of the pins 15 and the keys 37 will then be driven into position, wedging the head upwardly against the drill body and locking the same firmly in position. The outer en s of the keys may then be bent over, and the head will then be held against removal in operation.

The core-engaging dogs are mounted inrect'angular shaped blocks 38 which are formed to fit within the spaces between the upper ends of the supportin blocks 13 and at the lower ends thereof an within the recesses 39 in the lower end of the cutter body. This will be understood best from Fig. 1. The blocks 38 thus fit partially within the space between the cutter supports and partly in the cutter body, and will assist in taking the thrust due to the torque of the rotating drill during operation.

The supports 38 for the cutter dogs are welded in position as shown at 40, and when thus secured form an integral part of the said cutter body. Each blockis formed with a recess 41 therein, which with reference, particularly to Figs. 5 and 6, are curved on the arc of a circle to receive the cutter dogs 42 which are shaped to fit loosely therein. When said dogs are in ino rative position as shown in Fig. 5 they will e housed entirely within the supporting blocks 38 and will not interfere with the movement of the core.

Each cutter do is formed with a transverse opening 43 t erein somewhat below the central portion thereof .and adapted to receive a transverse pin 44. Said gain 44 is fitted at its ends through slots in icated at 45 in the supporting blocks 38 and projectinto openings in an outer plate 46 which will be understood from Fig.2.

The plates 46 are formed to fit about the outer portion of the dog supporting blocks 48, the upper end being reduced slightly in outer diameter to fit within the Io'werend of the drill collar 20 to which they are secured by screws indicated at 47 in Fig. 3. These plates thus support the transverse pins 44, and when said plates are moved upwardly along with the drill collar, the transverse pins 44 will also be moved as shown in Fig.

6 to force the cutter dogs into a core-engagwould tend to force mud past the rmg into ing position.

The drill collar is slidable over the upper 10, but it is secured drill body by means of non-rotatably to said are fitted through reckeys 50. Said keys cant, so that when it is desired emon tangular openings 51 in the drill collar at a point spaced above the drill head. They may be welded in position as shown at 52 so as to formduring operation an integral part of the drill collar. The inner sides of these ke s fit within keyways 53in the outer face of t e drill body. As will be seen from Fi 9 I employ a plurality of these keys, an it is to be understood that as many keys of this character may be employed as is necessar to withstand the driving torque between the drill collar and the dril I have shown each of the blocks 50 which form the keys just described, with threaded openings 54 therein, which may under ordinary circumstances be closed by threaded plugs. Said plugs may, however, be removed to allow the insertion of a nozzle upon a case gun,whereby lubricant may be forced.

into the keyways 53 and the space between the drill collar and the drill body.

I contein late filling the s ace between the drill colfir and the drill bo y with lubrito move the drill collar longitudinally relative to the drill body, the two parts will not stick together and prevent free movement.

It will be seen that the keyways 53 are longer than are the keys 50, so that suflicient longitudinal movement of the drill collar on the drill body may be obtained to provide the necessary re ative movement to move the core-engaging dogs as previously described. en this movement takes place, lubricant within the ke ways and between the drill collar and the dy will be um ed from one end thereof to the other. 11 t e outer side of the drill body on the upper end thereof I form channels 55 to allow the passage of lubricant. These channels will be seen in Fig. 4; the inner collar or sleeve 17 previously described maintains a close fit with the inner side of the drill body, thus tending to prevent the escape of the lubricant to the interior of the drill head by allowing the lubricant to fill the s ace formed at the upper end of the drill bod; when said body is moved downwardly. Similar passages 56 are formed between the. keyways 53 and the upper ends of the chamber 22 within which the floating packing ring 24 is mounted.

The floatin ring 24 is adapted to bear against the In ricant to prevent its passage downwardly. The pressure of li uid in the hole outside of the drill will be exerted against the lower end of the floating collar 24,

and when the drill is going into the hole the static fluid pressure will gradually increase. If it were. not for the floating packing ring, the increased pressure below the packing III . gethe'r as previously comes desirable to remove the i the keys against the upper en gaging dogs close to .nels 59 in the said drill body are provided to" connect with similar passages 60 in the tubular ins 15, thus allowing the flushing. flui to ow directly against the cutters 31 as is device will be assemble and. in thus assembling the device, it is to understood that the parts may be welded todescribed. When the rill is in cutting position with the weight of the drill stem resting downwardly upon the drill, the shown in Fi 1, and the co 41 will be withdra drill will pass upwardly rel 58 in the usual manner,

parts will be in the position engaging dogs The core cut y the and when it bedrill from the hole, an upward pull upon the drill stem will move the drill\collar 20 u wardly, thus pulling the core dogs inwar as shown in Fig. 6. into position to break and engage the core by a longitudinal movement sufliclent to bring ds of the-keyways 53. The weight ofthe drill will then be supported upon said keys, and the core will be broken off and moved upwardly with thedrill.

By maln'ng the core engaging dogs of arcuate shape, they are best'adapted to be withdrawn when desired. It the drill stem is moved to advance the do and is again set back on the bottom to rill, the dogs can easily move back from under the broken core due to their shape andthe ing said body, cutters on said supports,

without sticking path in which they can move.

By constructin thedrill head and securing it to the dri l body in the manner de-' scribed, I am enabled to mount the core enthe bottom of the hole so that the core maybe broken ofi near the lower end thereof, without material loss of the sampletaken.

A further advantage lies in the manner in which the flushing fluid may be carried downwardly into efiective engagement with the rolling cutters. The manner in which the lubricant is employed to prevent the sticking of the drill collar to the drill body is also a feature of advantage.

WhatI claim as new is:

1. In a core drill, a cutter head, cutter supports thereon, a drill body, means to secure said head to said body, cutters in said supports, core engaging means comprismg arcuate dogs housed slidably in-arcuate recesses in said body, a drill collar telescoping over said body, means connecting sai drill collar and said body but allowing a limited relative longitudinal movement between them, and means on said collar connected with said dogs to move said dogs and advance said dogs to core engaging position when p said drill collar is moved upwardly.

d head to said body,

into the core bary against the core These dogs will be moved 1 2. In combination, a drill head, cutters thereon, a drill body, means 'securin sai 'gidly between said head and said body, said blocks having) arcuatepassages therethrough-dogs slida passages, a drill collar on sa1d bod means on said collar en aging said ogs to to' and m core engagln relative movement of sai move said do position by t e drill collar. I a 3. In combination, a drill head, cutters thereon, a drill body, means securing said head to said body, core catcher blocks sets rigidly between said head and said body, sald blocks having arcuate passages therethrough, dogs slidable longitudmallyin said passages, a rill collar on said body, extensions on said collar, transverse pins sions engaging through openings in said dogs and adapted toslide said. dogs in said passages through movement of said collar. 4. In a combination, a drill head, cutters thereon, a drill body, means securin sai head to said body, core catcher bloc s set rigidly between said head and said body, said blocks having arcuate passages therethrough, dogs,slidable longitudinally in said passages, ward extensions on said collar, means on said extensions engagin said dogs, whereby an upward pull onsai collar will advance said dogs, and means to limit the movement of said collar relative to said body.

5. In a core drill, a tubular ody, a head thereon, cutter supports on saidhead erlilgagousings for core engaging dogs mounted on said head betwgensaid supports, dogs therein, a drill collar on said body, and means on said collar engaging said dogs to move them relative to said housings. Y

6. In a core dril a tubular body, a head thereon, cutter supports on said head engaging saidbody, cutters on said supports, housin for core engaging dogs mounted on said head between said supports, there being arcuate openings in said housings therein, a drill collar on said body, and extensions on said collar-engagingsaid dogs to move said dogs in said openings.

7.-In a'core drill, a tubular body, a comparatively short ring-shaped head, cutter supports mounted on said head and engaging said body, engagement with said supports, housings between said supports on said head, arcuate dogs slidable in openings in said housings, a drill collar on said body, and means on sai collar responsive to a relative upward movement of said-collar to move said dogs.-

8. In a core drill, a tubular body, a comparatively short ring-shaped head, cutter suports mounted on said head and engaging said body, means on said body slidab e into corecatcher bloc set le longitud nally in said means on said body slidable into on said exten-,'

, (logs slidable engagement with said supports, housings between said supports on said head, arcuate dogs slidable 1n openings in said housings, a drill collar on said body, and downward ex- 5 tensions on said collar engaging with said dogs whereby a longitudinal movement of said collar on said body will slide said dogs in said openings.

9. A core drill including a tubular body, a head secured thereto, cutters on said head, a drill collar telescoping over saidbody and having a limited longitudinal movement relative thereto, core on aging dogs adapted to be moved by said co ar, and a floatin packing ring between said collar and sai body to enclose lubricant within said collar.

10. A core drill including a tubular body, a head secured thereto, cutters on said head, a drill collar telescoping over said body and having a limited longitudinal movement relative thereto, core engaging dogs adapted to be moved by said collar, keys on sai collar en aging within keyways in said body, and doatin packing ring fitting between said 25 body and said collar and servin to confine lubricant between said collar and said body within said keyways.

11. A core drill including a tubular body, a head securedthereto, cutters on said head 30 a drill collar telescoping over said body and having a limited longitudinal movement relative t ereto, core en aging dogs adapted to be'moved by said co lar, keys on said collar extending into keyways in said body, lubricant circulating passages between said collar and body, means to pack one end of said passages and a floating acking ring movable between said collar and body at the other end to allow movement of lubricant between said packing means and said rin 12. In a core drill, a tubudar body, a head thereon, cutters on said head, core catcher housing associated with said body havin arcuate chambers therein opening toward 5 the inner side of said body, arcuate dogs fitting freel in said chambers and slidable therein, a drill collar aving a limited sliding movemeqt relative said body, and means on said collar engaging said dogs and adapted to slide them longitu inally in said opemn when said collar is moved relative to said In testimony whereof, I hereunto afiix my 5 signature, this the 18 day of March, A. D.

LOUIS H. WELLENSIEK. 

